Path: utzoo!attcan!uunet!samsung!zaphod.mps.ohio-state.edu!sunybcs!ubvms!v108lszu
From: v108lszu@ubvms.cc.buffalo.edu
Newsgroups: sci.electronics
Subject: Last post: Anyone know steppers?
Message-ID: <691.2607394d@ubvms.cc.buffalo.edu>
Date: 21 Mar 90 13:20:29 GMT
Organization: Academic Computing Services, University at Buffalo
Lines: 29

I'm not sure if this is the right newsgroup for this, but...is anyone out
there experienced in the use of stepping motors?

I've got a couple which I have managed to get working through the use of
my parallel port (on my PC clone), which works OK. My question is this: for
a given number of steps per revolution and size of motor, how rapid a rotation 
rate can I reasonably expect?  I plan to use the motors in a device in which
*both* fine and rapid positioning will be desired. I guess it's kind of a
tradeoff between the two, but I really don't know enough about steppers to 
be sure I'm getting everything out of them that I can.

Would the use of a more elaborate (ie, commercial) PC interface allow me to
step them faster? I've gotten up to about 20 RPM with a 72 step/rev motor,
which seems pretty good so far. Another point is this:  I need to control at
least two motors at once (possibly three or four) and anything I build to 
divert the control signals from the parallel port to each motor in turn will
no doubt only slow things down!

I'd appreciate email from anyone who can shed any light on this subject...if
you're interested in telescope mirror making, I'd also like to discuss that 
as well. That's what I'm aiming for.........

Thanks...PF


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Pat Ferrick/KA2AYK               Call me "Ferrick Bueller" only if you must!!!
V108LSZU@UBVMSD.cc.buffalo.edu
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